l=[1,2,3,4,5,6,7,8,9,10,27,36,46,58,69]
find_num=6
def find_element(l,find_num):
    if len(l)==0:
        print('不存在')
        return
    mid_num=len(l)//2
    if find_num>l[mid_num]:
        l1=l[mid_num+1:]


